<template>
  <div class="login_container">
    <div class="login_box">
      <!-- 头像区域 -->
      <div class="avatar_box">
        <img src="../../public/用户.png" />
      </div>
      <!-- 登陆表单区域 -->
      <!-- ref直接获取表单的实例对象 -->
      <el-form
        ref="loginFormRef"
        :model="loginForm"
        :rules="loginFormRules"
        label-width="0px"
        class="login_form"
      >
        <!-- 用户名 -->
        <el-form-item prop="username">
          <el-input v-model="loginForm.username" prefix-icon="el-icon-user"></el-input>
        </el-form-item>
        <!-- 密码 -->
        <el-form-item prop="password">
          <el-input v-model="loginForm.password" prefix-icon="el-icon-lock" type="password"></el-input>
        </el-form-item>
        <!-- 按钮 -->
        <el-form-item class="btns">
          <el-button type="primary" size="medium" @click="login">登陆</el-button>
          <el-button type="info" size="medium" @click="resetLoginForm">重置</el-button>
        </el-form-item>
      </el-form>
    </div>
  </div>
</template>
<script>
export default {
  data() {
    return {
      //这是登陆表单的数据绑定对象
      loginForm: {
        username: 'admin', //数据属性
        password: '123456'
      },
      //这是表单的验证规则对象
      loginFormRules: {
        //验证用户名是否合法
        username: [
          { required: true, message: '请输入登陆名称', trigger: 'blur' },
          { min: 3, max: 10, message: '长度在 3 到 10 个字符', trigger: 'blur' }
        ],
        password: [
          { required: true, message: '请输入登陆密码', trigger: 'blur' },
          { min: 6, max: 15, message: '长度在 6 到 15 个字符', trigger: 'blur' }
        ]
      }
    }
  },
  methods: {
    resetLoginForm() {
      this.$refs.loginFormRef.resetFields()
    },
    login() {
      this.$refs.loginFormRef.validate(async valid => {
        //console.log(valid);//false 表示表单预验证失败
        if (!valid) return
        const { data: res } = await this.$axios.post('login', this.loginForm)
        //console.log(res);
        if (res.meta.status !== 200)
          return this.$message.error('用户名或密码错误!')
        this.$message.success('登陆成功')
        // 1.将登陆成功之后的 token .保存到客户端的sessionStroage中
        //  1.1项目中除了登陆之外的其他API接口,必须在登陆之后才能访问
        //  1.2token只应当在当前网站打开期间生效,所以将token保存在          sessionstorage中
        window.sessionStorage.setItem('token', res.data.token)
        //  2通过 编程式导航跳转到后台主页,路由地址是/home
        this.$router.push('/home')
      })
    }
  }
}
</script>
<style lang="less" scoped>
.login_container {
  background-color: #2e6f86;
  height: 100%;
}
.login_box {
  width: 450px;
  height: 300px;
  background-color: #fff;
  border-radius: 3px;
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  .avatar_box {
    background-color: #fff;
    height: 130px;
    width: 130px;
    border: 1px solid #eee;
    border-radius: 50%;
    padding: 10px;
    box-shadow: 0 0 10px #dddddd;
    position: absolute;
    left: 50%;
    transform: translate(-50%, -50%);
    img {
      height: 100%;
      width: 100%;
    }
  }
}
.login_form {
  position: absolute;
  bottom: 0;
  width: 100%;
  padding: 0 20px;
  box-sizing: border-box;
}
.btns {
  display: flex;
  justify-content: space-between;
}
.el-input {
  font-size: 20px;
}
/deep/.el-input--prefix .el-input__inner {
  padding-left: 35px;
}
</style>